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Glossary

Bluetooth audio codecs

How audio is compressed over Bluetooth (SBC, AAC, aptX, LDAC, LC3). Both phone and earbuds must support the same codec.

SBC is universal; AAC works best with iPhones; aptX and LDAC offer higher bitrates on many Android phones; LC3 is the newer, efficient LE Audio codec. The codec only helps if both devices support it.

Also called: AAC, aptX, LDAC, LC3, SBC

More terms

Video resolution (4K, 8K, fps)The size and frame rate of video. 4K at 60 fps is smooth and detailed; 8K is larger but rarely needed.OS upgrades and security updatesHow long the maker promises new Android/iOS versions and security fixes. Longer support = safer, longer-lasting phone.OIS (optical image stabilisation)A moving lens or sensor that cancels hand shake — sharper night photos and steadier video.CPU socketThe physical connector on the motherboard. A CPU only fits motherboards with the same socket (e.g. AM5, LGA 1851).L3 cacheFast memory on the processor that keeps frequently used data close. Large caches (e.g. X3D chips) help games a lot.Fingerprint sensorUnlocks the phone with your finger — under the screen (optical or ultrasonic) or on the side button.

All glossary terms